Applicable standard for Sandwich Construction

[Yash16]

Hello,

I want to design a sandwich construction (of length 65mm) which will be bolted in two flanges by using long studs. Application will be in steam service up to 20 bar pressure and sizes will be 1 inch to 4 inch in diameter. The said sandwich construction will not have flanges and will have equivalent thickness of raised face of flange which will be butted against to seal. To design this as per ASME, I have following question:

1) Typical ASME code ask to follow "Design for cylindrical shell with opening" under ASME-Code SECTION VIII, DIV I, APPENDIX 1-1; 1-2; UG-27; UG-37. Wall thickness calculation come very low with this and mostly 2.4mm thickness as per ASME Sec - VIII Div I - UG-16 b-(1-5); UG 36 C-3a governs it. As I said, this will be butted between two flanges so if I calculate the axial force which bolts will apply on this construction, axial stresses will be very high and if I want to consider those, thickness has to be about 10mm. Does ASME considers this possibility and have provision to design? OR shall I take butted flange calculations to get maximum applicable force and use the same in design??

Thanks in advance. It is really puzzling me about how to go ahead in this.

Nandkumar.

 

[SnTMan]

I'm puzzled as well.

 

[vpl]

A drawing might help others in understanding what you're trying to do.

Patricia Lougheed

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